Emerson Rosemount 4600 Reference Manual page 54

Troubleshooting
September 2016
Table 5-1. Troubleshooting
Symptom
Transmitter milliamp reading is zero
Transmitter Not Communicating with
Field Communicator
Transmitter milliamp reading is low or
high
Transmitter will not respond to changes in
applied pressure
Digital Pressure Variable reading is low or
high
Digital Pressure Variable reading is erratic
Milliamp reading is erratic
HART message reading:
"Brown-out condition detected."
HART message reading:
"Configuration not update due to
brown-out."
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Corrective actions
Verify power is applied to signal terminals.
Check power wires for reversed polarity.
Verify terminal voltage is 11.25 to 42.4 V dc.
Verify the output is between 4 and 20 mA or saturation levels.
Verify clean dc Power to transmitter (Max ac noise 0.2 volts peak to peak).
Check loop resistance, 250 Ω minimum (PS voltage -transmitter
voltage/loop current).
Check if unit is addressed properly.
Verify applied pressure.
Verify 4 and 20 mA range points.
Verify output is not in alarm condition.
Verify if 4 – 20 mA output trim is required.
Check test equipment.
Check impulse piping or manifold for blockage.
Verify applied pressure is between the 4 and 20 mA set points.
Verify output is not in alarm condition.
Verify transmitter is not in Loop Test mode.
Check test equipment (verify accuracy).
Check impulse piping for blockage or low fill in wet leg.
Verify transmitter is calibrated properly.
Verify pressure calculations for application.
Check application for faulty equipment in pressure line.
Verify transmitter is not reacting directly to equipment turning on/off.
Verify damping is set properly for application.
Verify power source to transmitter has adequate voltage and current.
Check for external electrical interference.
Verify transmitter is properly grounded.
Verify shield for twisted pair is only grounded at one end.
Verify power source to transmitter has adequate voltage and current.
Check loop resistance, 250 Ω minimum (PS voltage -transmitter
voltage/loop current).
Cycle power and repeat configuration change.
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Troubleshooting
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